| (57) A process for the preparation of N-phosphonomethyt- glycine characterised in that
it comprises:
(a) reacting 1,3,5-tricyanomethylhexahydro-1,3,5-triazine with an acyl chloride corresponding
to the following general formula:
wherein X represents chlorine, bromine or iodine; and R represents an aliphatic or
aromatic group; to form the N-cyanomethyl-N-chloromethyl amide of the acyl chloride
corresponding to the following general formula:
wherein X and R are as defined above;
(b) reacting the amide formed in (a) with a phosphite corresponding to the following
general formuia:
wherein R1 and R2 represent both aromatic groups or both aliphatic groups; and R3 represents an aliphatic group or an alkali metal; to form a phosphonate corresponding
to the following general formula
wherein R' and R2 are as defined above; and
(c) hydrolyzing the phosphonate formed in (b) to yield N-phosphonomethylglycine is
disclosed. Thus, an improved production for a valuable herbicide is provided.
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